USB storage device, devfs, and /dev/scsi/*

[Hugo van der Merwe <s13361562@bach.sun.ac.za>]

I've got a USB storage device (what should one call these things? I
hate calling it a "flash disk" since I feel it's not a disk (disc?) ;)
It worked great at one point. However, recently, it still seems to
register fine, etc etc, but the mountable device no longer appears in
my devfs /dev/. How can I debug this, what should I look for, what
might be missing?

Thanks,
Hugo